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S3) (35p) In the circuit in the figure, VoD-121 is given as R 50k, R2-10k, RD-Rg - Ik, R, =3k. The amplitude of the small amplitude v signal applied to the amplifier is given as 250mV and the frequency as 1kHz. a) Find the operating point of the circuit. b) By drawing the small-signal AC equivalent circuit of the circuit valid at medium frequencies, A. Find the voltage gain c) Calculate the upper cutoff frequency f of the amplifier. d) Calculate the Gain bandwidth (GBW) of the amplifier (f = BW) VD MOSFET parameters MA K = 8 V, = 12 = Rp C: ww Rp wa R w 0. C = 05pF C = 0.1pF W G WH Ipucu: K, HC L R; www w w 아
S2) (35p) In the circuit in the figure, as R=2.08k R=2.08k2, R=105.9k2, R2-20.4k2, R 10.8 R25k, &m=38.9mA/V,r=9k, C =15pF, C=1pF is given. Given that the amplifier's lower cutoff frequency is o =200rad / s: a) Draw the AC equivalent circuits of the amplifier for low frequencies and high frequencies separately b) By taking the A coefficient value of 4-15-according to the last two digits (xx) of your student the values of C, and C, given that xx 10 = 4.0 and it is accepted that the effect of C, can be neglected in the calculation of the lower cutoff frequency R G 7 с w 11 Rc w RI WWW R ww HH ww R2 ve 바
S1 (30p) In the circuit in the figure, the parameters of Zener diodes with the same characteristics are given as Vzo=4+0.08.xx V and V,-0.6+2x10xx V according to the last two digits (xx) of your student number (r=0). Accordingly, change Vor=f(vin) for the range -20 <v <201 (horizontal axis v to vertical axis v) R a) When Z1 and 22 are connected as in the figure, b) www When only Z1 is connected to the output Draw to scale for the situations. zi IN KDHI X2